Critical roles of RasGRP1 for invariant NKT cell development.

Critical roles of RasGRP1 for invariant NKT cell development.
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DOI:
10.4049/jimmunol.1003798
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发表时间:
2011-11-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Zhong XP
Zhong XP
中科院分区:
其他
文献类型:
--
作者:
Shen S;Chen Y;Gorentla BK;Lu J;Stone JC;Zhong XP

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不变的NKT(INKT)细胞谱系包括CD4+和CD4-亚群。一般情况下,控制这种亚群分化和iNKT细胞成熟的机制还不完全清楚。RASGRP1是一种鸟嘌呤核苷酸交换因子,用于T细胞受体诱导的RAS-ERK1/2通路的激活,对传统的αβT细胞发育至关重要,但对于产生调节性T细胞是必不可少的。它在iNKT细胞中的作用尚不清楚。在这里,我们报告了RASGRP1-/-小鼠iNKT细胞通过细胞内在机制严重减少。在RASGRP1-/-小鼠剩余的iNKT细胞中,有选择性地缺乏CD4+亚群。此外,RASGRP1-/-iNKT细胞在T细胞受体诱导的体外增殖中存在缺陷。这些观察结果表明,RASGRP1不仅对iNKT细胞的早期发育很重要,而且对CD4+iNKT细胞的产生/维持也很重要。我们的数据提供了遗传证据,表明CD4+和CD4-iNKT细胞是不同的亚系,它们的发育需要不同的信号。
The invariant NKT (iNKT) cell lineage contains CD4+ and CD4- subsets. The mechanisms that control such subset differentiation and iNKT cell maturation in general have not been fully understood. RasGRP1, a guanine nucleotide exchange factor for T cell receptor-induced activation of the Ras-Erk1/2 pathway, is critical for conventional αβ T cell development but dispensable for generating regulatory T cells. Its role in iNKT cells has been unknown. Here we report severe decreases of iNKT cells in RasGRP1-/- mice through cell intrinsic mechanisms. In the remaining iNKT cells in RasGRP1-/- mice, there is a selective absence of the CD4+ subset. Furthermore, RasGRP1-/- iNKT cells are defective in T cell receptor induced proliferation in vitro. These observations establish that RasGRP1 is not only important for early iNKT cell development, but also for the generation/maintenance of the CD4+ iNKT cells. Our data provides genetic evidence that the CD4+ and CD4- iNKT cells are distinct sub-lineages with differential signaling requirements for their development.
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